Python/dynamic_programming/fibonacci.py

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2016-09-26 10:28:43 +00:00
"""
This is a pure Python implementation of Dynamic Programming solution to the fibonacci sequence problem.
"""
class Fibonacci:
def __init__(self, N=None):
self.fib_array = []
if N:
N = int(N)
self.fib_array.append(0)
self.fib_array.append(1)
for i in range(2, N + 1):
self.fib_array.append(self.fib_array[i - 1] + self.fib_array[i - 2])
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elif N == 0:
self.fib_array.append(0)
print(self.fib_array)
def get(self, sequence_no=None):
"""
>>> Fibonacci(5).get(3)
[0, 1, 1, 2, 3, 5]
[0, 1, 1, 2]
>>> Fibonacci(5).get(6)
[0, 1, 1, 2, 3, 5]
Out of bound.
>>> Fibonacci(5).get(-1)
[0, 1, 1, 2, 3, 5]
[]
"""
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if sequence_no != None:
if sequence_no < len(self.fib_array):
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return print(self.fib_array[: sequence_no + 1])
else:
print("Out of bound.")
else:
print("Please specify a value")
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if __name__ == "__main__":
print("\n********* Fibonacci Series Using Dynamic Programming ************\n")
print("\n Enter the upper limit for the fibonacci sequence: ", end="")
try:
N = int(input().strip())
fib = Fibonacci(N)
print(
"\n********* Enter different values to get the corresponding fibonacci "
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"sequence, enter any negative number to exit. ************\n"
)
while True:
try:
i = int(input("Enter value: ").strip())
if i < 0:
print("\n********* Good Bye!! ************\n")
break
fib.get(i)
except NameError:
print("\nInvalid input, please try again.")
except NameError:
print("\n********* Invalid input, good bye!! ************\n")
import doctest
doctest.testmod()